99738561 has 24 divisors (see below), whose sum is σ = 145228800. Its totient is φ = 60854976.

The previous prime is 99738533. The next prime is 99738589. The reversal of 99738561 is 16583799.

It is an interprime number because it is at equal distance from previous prime (99738533) and next prime (99738589).

It is not a de Polignac number, because 99738561 - 2¹⁹ = 99214273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99738561.

It is not an unprimeable number, because it can be changed into a prime (99738061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63615 + ... + 65163.

It is an arithmetic number, because the mean of its divisors is an integer number (6051200).

Almost surely, 2^99738561 is an apocalyptic number.

It is an amenable number.

99738561 is a deficient number, since it is larger than the sum of its proper divisors (45490239).

99738561 is a wasteful number, since it uses less digits than its factorization.

99738561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1692 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 99738561 is about 9986.9194950195. The cubic root of 99738561 is about 463.7540328960.

The spelling of 99738561 in words is "ninety-nine million, seven hundred thirty-eight thousand, five hundred sixty-one".